Why do I get a cold when I start my period?

In brief:
Vagal reflex

It could be that when your period starts you experience an episode of vaso-vagal syncope which can result in a drop in pulse and blood pressure, as well as increased perspiration - all of which you could percieve as feeling "cold".

Some women also have nausea which can also be caused by the vaso-vagal reflex associated with the menses.

In brief:
Vagal reflex

It could be that when your period starts you experience an episode of vaso-vagal syncope which can result in a drop in pulse and blood pressure, as well as increased perspiration - all of which you could percieve as feeling "cold".

Some women also have nausea which can also be caused by the vaso-vagal reflex associated with the menses.
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